Answer: d + 12 = 20
Step-by-step explanation: In this problem, we are asked to write an algebraic expression that represents the sentence.
The key to understanding this problem is by looking at the keyword "sum." The word sum means addition so reading this problem from left to right, the sum of d and 12 that's d + 12 "is 20" = 20.
So, d + 12 = 20 will be our algebraic expression.